A bipartisan Senate effort to approve the controversial Keystone XL Pipeline collapsed Monday.
Senate Majority Leader Harry Reid, who opposes Keystone, agreed to allow a vote on the bill to approve Keystone.
In exchange, Reid wanted Republicans to clear the Energy Efficiency Bill.
When GOP Senators insisted on additional amendments to the Energy Efficiency Bill, Reid refused to schedule the vote.
Both sides blame each other for failing to move the bill forward.